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Finding the Fourth Proportional to 1,487.60, 2,231.50 and 513.58

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Solution

The fourth proportional to 1,487.60, 2,231.50 and 513.58 is: 770.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,487.60 : 2,231.50 = 513.58 : x
  2. Step 2: Convert to fraction form
    1,487.60/2,231.50 = 513.58/x
  3. Step 3: Cross multiply
    1,487.60x = 2,231.50 × 513.58
  4. Step 4: Simplify right side
    1,487.60x = 1,146,053.77
  5. Step 5: Solve for x
    x = 1,146,053.77/1,487.60
  6. Step 6: Final answer
    x = 770.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.